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Упит dcterms_subject_txt:In Pit Crushing and Conveying

2365 items

  • Mine ventilation system planning using genetic algorithms

    Nikola Lilić, Ranka Stanković, Ivan Obradović (1997)
    The most common problem in contemporary mining practice related to the planning and analysis of ventilation systems is the optimization of partially regulated air distribution in mine ventilation networks. This paper presents a two step optimization procedure for partly regulated air distribution in mine ventilation networks. The first step is the determination of air distribution in all branches using the well known Hardy-Cross method. In the second step the distribution and parameters of air flow regulators with minimum engaged ...
    coal, lignite, and peat; ventilation systems; coal mining; underground mining; ventilation; mathematical models; design; air flow; optimization; calculation methods

  • Geologic Information System of Serbia

    Branislav Blagojević, Branislav Trivić, Ranka Stanković, Nenad Banjac, Olivera Kitanović (2011)
    Geologic information system of Serbia (GeolISS) represents repository for digital archiving, query, retrieving, analysis and geologic data visualization. The GeolISS is implemented through ESRI ArcGIS technology, and is designed to operate as a personal geodatabase (MS Jet 4.0 Engine) and SDE enterprise geodatabase in MS SQL Server. The objective of GeolISS implementation is integration of existing geologic archives, data from published maps at different scales, newly acquired field data, as well as Web publishing of geologic information. Physical implementation ...
    Geologic information system, Conceptual model, Logical model, Implementation, Geodatabase
    ... database designed special ArcGIS extension was designed and implemented in MS Visual Studio and ArcObject.NET API to support data entry in both; personal and enterprise geodatabase. ...
    ... implementation of GeolISS has been guided with conceptual and logical model in those specified the basic kinds of geologic entities of interest and how they are described. The attempt has been influenced by NADM-C1 implementation from USGS and CGS, by GeoSciML interchange scheme from CGI, IUGS (www ...
    ... implemented in the GeolISS allows the recording of data source, links to the bibliographical references and persons involved and responsible for data acquisition. Metadata also include essential information’s about project, for which the data are to be collected. For data entry in GeolISS database ...

  • Gate Road Support Deformation Forecasting Based on Multivariate Singular Spectrum Analysis and Fuzzy Time Series

    Luka Crnogorac, Rade Tokalić, Zoran Gligorić, Aleksandar Milutinović, Suzana Lutovac, Aleksandar Ganić (2021)
    Underground mining engineers and planners in our country are faced with extremely difficult working conditions and a continuous shortage of money. Production disruptions are frequent and can sometimes last more than a week. During this time, gate road support is additionally exposed to rock stress and the result is its progressive deformation and the loss of functionality of gate roads. In such an environment, it is necessary to develop a low-cost methodology to maintain a gate road support system. ...
    deformacije podgrade, lasersko skeniranje, višekanalna singularna spektralna analiza, prognoza, klasterisanje fuzzy vremenskih serija
    ... MAPEi, (30) MAPEi and AMAPE are represented in Table 10. Energies 2021, 14, 3710 15 of 20 Within the grouping step, we only have signal and noise components and we use two groups of indices, I; = {Avy,,Ay, } and Iz = {Av,,Ay, } and associate the group I; with signal component and the group I with noise ...
    ... point over observed and forecasted periods. A computational process is performed in the Numerical Example section to repre- sent the possibilities of model and conclusions are provided in the Results and Conclusion section. Obtained results show a high level of correlation of original and reconstructed series ...
    ... signal and noise components and we use two groups of indices, I1 = { λV1 , λV2 } and I2 = { λV3 , λV4 } and associate the group I1 with signal component and the group I2 with noise. The reconstructed series of x coordinates of the marker M1 composed of the signal components are represented in Table ...

  • Natural two-dimensional pyrophyllite: Nanoscale lubricant, electrical insulator and easily-machinable material

    Borislav Vasić, Radoš Gajić, Ivana Milošević, Žarko Medić, Marina Blagojev, Marko Opačić, Aleksandar Kremenović, Dejan Lazić (2022)
    Pyrophyllite, with the chemical formula Al2Si4O10(OH)2, is a naturally occurring and abundant van der Waals mineral belonging to the group of phyllosilicates. It is very soft, layered crystal used for sculpting and an excellent electrical and thermal insulator aimed for the operation at high pressure and temperature. Here, for the first time, two-dimensional (2D) pyrophyllite obtained by both mechanical and liquid phase exfoliation is presented and investigated at the nanoscale. The layered structure provides low friction coefficient of around ...
    Atomic force microscopy, Insulating properties, Nanofriction and wear, Natural two dimensional materials, Phyllosilicates, Pyrophyllite

  • The interaction of organoselenium trans-palladium(II) complexes toward small-biomolecules and CT-DNA

    Vera M. Divac, Aleksandar Mijatović, Marina D. Kostić, Jovana Bogojeski (2017)
    Serija organoselenijum trans-paladijum(II) kompleksa 1 (bis(2-(fenilselanilmetil)oksolan)dihloropaladijum(II)), 2 (bis(2-(fenilselanilmetil)oksan)dihloropaladijum(II)) i 3 (bis(2) ,2-dimetil-3-(fenilselanil)oksan)dihloropaladijum(II)) su korišćeni za ispitivanje reaktivnosti ovog specifičnog tipa kompleksa prema različitim bio-molekulima. Ovaj sistem je od posebnog interesa jer se jako malo zna o supstitucionim reakcijam organoselenijum paladijum(II) kompleksa sa trans konfiguracijom. Zamena koordinovanog hlorida sa serijom malih bio-molekula (l-Met, l-His, l-Cis, GSH i 5′-GMP) proučavana je pod uslovima pseudo-prvog reda kao funkcija koncentracije nukleofila i temperature korišćenjem tehnika zaustavljenog toka. Rezultati za proučavane komplekse ukazuju da ...
    Pd(II), Selen, Substitucija, Kinetika, Mehanizam

  • Softverski alati za korišćenje resursa za srpski jezik

    Ivan Obradović, Ranka Stanković (2008)
    ... used in practice and over time appeared in the resources, starting with the Aurora code, followed by the ISO 8859-2 and ISO 8859-5 codes, up to Unicode. Thus the WS4LR software tool was created, which repre- sents and integrated and adaptable software solu- tion, enabling the management and manipulation ...
    ... text processing using dictionaries in LADL format. But since Intex did not enable processing of texts in Unicode and this coding scheme became more and more frequently used, the Unitex2 and Nooj3 system were developed, both allowing processing in Unicode, and sub- sequently started to suppress Intex ...
    ... “highlighting”, namely by repre- senting them in blue, in order to make them more easily recognizable in the text. The text in Eng- lish is on the left hand side, and the correspond- ing text in Serbian on the right. Results obtained by searching aligned texts with bilingual queries can be used for different ...

  • From post-disaster landslides inventory to open landslides data

    Biljana Abolmasov, Miloš Marjanović, Uroš Đurić, Jelka Krušić (2021)

  • Post Early Miocenevertical-axis clockwise rotation in the West Vardar Zone of Serbia

    Vesna Lesić, Emo Marton, Vesna Cvetkov, Dragana Jovanović (2018)
    ... sediments and Cenozoic igneous rocks. The area covered by this study belongs to the West Vardar and Jadar-Kopaonik units semsw Schmid et al. (2008). In this 160 km long strip we sampled on the north in the wider Rudnik Mts. area seven localities of Late Cretaceous micritic limestones and one locality ...
    ... carried out on locality (when applicable) and regionallevel. The obtained results show that the remanent magnetization both in the igneous rocks and sediments resides in magnetite. The locality mean directions for Late Cretaceous sediments are well defined and the remanenceis of post tilting: age. For ...
    ... of flysch and seventeen sites of Oligocene-Earliest Miocene igneous rocks of different composition. In the south, ın the wider Kopaonik Mts. Area we sampled cight sites of dacitoandesites andfifteen localities of granodiorites both of Oligocene age. Samples were drilled and oriented in situ both by ...

  • Simple 2D Gravity-density inversion for modeling of the sedimentary basin basement

    Ivana Vasiljević, Snežana Ignjatović, Dragana Đurić, (2019)

  • Building Terminological Resources in an e-Learning Environment

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... Moodle. In this paper we describe how we have tackled this problem1. In the next section we give a brief outline of terminological resources in general and RudOnto in particular. Section 3 offers an overview of state of the art of Moodle implementation and blended learning at FMG. In Section 4 ...
    ... broader and the narrower concept, respectively. Hence, a taxonomy in essence offers a hierarchical classification of concepts, in addition to the terms that describe them, and the definitions that explain them in more detail. Thesauruses offer and even more complex semantic structure, and due to ...
    ... becoming the reference resource for mining terminology in Serbian in e-format. As a central terminological resource it is also invaluable in the learning process, and it is included in the blended learning approach at the Faculty of Mining and Geology through an export of its subsets to the Moodle ...

  • Valorization of non-balanced coal reserves in Serbia for underground coal gasification

    David Petrović, Lazar Kričak, Milanka Negovanović, Stefan Milanović, Jovan Marković, Nikola Simić, Ljubisav Stamenić (2019)
    In the name of a better and safer energy future, it is our responsibility to focus our knowledge and activities to save on imported liquid and gas fossil fuels, as well as coal on which energy security of Serbia is based. The rationalization in the use of available energy resources certainly positively affects economy and the environment of a country. This paper indicates motivations for the application of the underground coal gasification process, as well as surface gasification for ...
    ugalj, gasifikacija, zaštita životne sredine, skladištenje, solarna
    ... on in various types of gas generators mounted on the surface. In both cases, from the obtained gas, CO,, NO„ and other harmful gases are extracted in scrubbers. This means that further gas combustion byproducts do not pollute the almosphere in comparison with traditional coal com- bustion. In addition ...
    ... usly in several possible directions (direct, reversed and radial). The velocity of the firehead spreading in the reaction zone is positively affected by the separation of the gases from the cracks of the coal layer, which are in contact with heated air in the channel additionally burn and accelerate ...
    ... Application in Out of Balance Coal Reserves in BiH, in Serbian, Ph. D. thesis, Faculty of Mining, Geology and Civil Engineering, Tuzla, Yugoslavia, 1987 3] Ag Mohamed, Acheick., et. al., Viability of UCG with Carbon Capture and Storage, 600 UCG Final Re- port, University School of Public and Environmental ...

  • Data from the Digital Repository of the Faculty of Mining and Geology in eScience (eNauka)

    Biljana Rujević, Mihailo Škorić (2024)
    The paper describes linking the Digital Repository of the University of Belgrade, Faculty of Mining and Geology, with the eScience system in terms of transferring metadata about the results of researchers' scientific work. The steps taken to ensure a smooth harvesting of metadata are outlined. Additionally, a presentation of additional improvements to the OAI system is provided, aiming to contribute to the automatic linking of authors with their results in the eScience system.
    репозиторијуми, еНаука, метаподаци, Рударско-геолошки факултет

  • Fluid inclusion systematics in the Okoška gora polymetallic deposit

    Aleš Šoster, Miloš Velojić, Barbara Potočnik Krajnc, Matej Dolenec (2021)
    ... addition, the S2 and Q2 inclusions follow the growth zonesofthe crystals, indicating the simultaneouscrystal growth and fluid nclusion entrapement. Conversely, thc itregular, needle-like, and ameboid inclusions ofQ1 and S1 occur in linear, subparallel structures and have a higher proportion of liquid ...
    ... sericite and adularia. The predominantminera! style is stockwork breccia with open-space veins and abundantdruse-lined cavities fill terminated crystals of gangue and ore minerals. Ore disseminations are minor and. restricted to pyrite. Ore minerals have not been observedto replace the host-rock. In | cast ...
    ... inclusions in sphalerite and quartz from five samples of ore were investigated in this study. Both types of quartz form well-developed euhedral c whereas sphalerite forms euhedralcrystals or fills the open spaces between pre-existi and gangue minerals. Sphalerite is honey yellow or dark brown in color and ...

  • Karst aquifer impact on the formation of surface runoff: case study of the Resava River catchment, Serbia

    Marina Mitrašinović, Vesna Ristić Vakanjac, Veljko Marinović, Saša Milanović, Ljiljana Vasić, Dušan Polomčić (2022)
    The paper compares the flow regimes of the Resava River at the gauging stations of the Manasija Monastery (upper course) and the town of Svilajnac (lower course). The hydrological analysis encompasses a multiyear period of monitoring (1982–2020). The water budget and baseflow index are assessed for the catchment areas monitored by the Svilajnac station (683 km2) and the Manasija Monastery station (358k m2), considering the overall monitoring period and characteristic years. The results indicate that the specific runoff in ...
    hydrogeological characteristics, water regime, water balance, karst aquifer, Resava catchment area
    ... terrain, and the rest is non- karst. The same applies to dry years but in that case the specific runoff in the upper catchment ofthe Re- sava River is twice the specific runoff in the entire catchment in the same dry ycar, or the arca covcred by the gauging station at Svilajnac. However, in wet years ...
    ... Kamen, and Vrtačelje (Avramović, 2005). Hydrogeological characteristics of the Resava catchment Based on the lithostratigraphic units and structur- al porosity, there are threc types of aquifers in the study arca. https://bgd.bg/review-bgs 1. Intergranular aquifers in the central and western ...
    ... formed in Quater- nary and Ncogene sediments. Thcy are recharged by infiltration of precipitation, water from surface strecams, and in part by karst aquifer groundwater. They are drained directly into the river, generally during dry periods, but largely by wells that service public and industrial ...

  • New approach to correlation of hydrocarbon reservoirs in sandstone layers of the "Mokrin" field"

    Saša Ivanišević, Dejan Radivojević (2018)
    геофизички каротаж, депозиционе средине, лежишта угљоводоника, миоцен, пост‐ рифтнo, секвенциона стратиграфија
    ...  Due to  inconsistencies  in the selection of markers  in designation and correla‐ tion of hydrocarbon reservoirs, this approach has  led to  incorrect assessments of oil and gas reserves,  confusion in the interpretation of hydrodynamic measurements and reduced efficiency in the process of  reservoi ...
    ...   level and  the  increase  in  the  level of  depositional energy, which leads to the reduction in the content of shale and increase in the content of  sand in the formation.  Bell shape of the GR log follows the trend of grain tapering out upwards, pointing  to the reduction in the level of deposi ...
    ... of A, D, E, F and G reservoirs as individual sandstone layers in the “Mokrin” field.  Inconsistencies in the  selection  of  markers,  designation  and  correlation  of  hydrocarbon  reservoirs  have  led  to  incorrect  assessments of oil and gas reserves and confusion in the interpretation of hydrody ...

  • Medical Domain Document Classification via Extraction of Taxonomy Concepts from MeSH Ontology

    Mihailo Škorić, Mauro Dragoni (2019)
    This paper is a result of a task that was presented to attendants of Keyword Search in Big Linked Data summer school, that was organized by Vienna University of Technology, under the Keystone COST action in the summer of 2017. It presents a specific approach to the classification via creation of minimal document surrogates based on the US National medical library’s MeSH ontology, which is derived from the Medical Subject Headings thesaurus. In a series of previously classified medically ...
    document classification, MeSH, ontology, information extraction
    ... reflect on and compare different classification rules, as well as to determine whether some rulesets can (and to what extent) be considered successful. In the following chapters, these experiment stages will be described in more detail, in order to get a better insight into the methods used and the results ...
    ... concepts in the MESH ontology and that appear in those documents. The annotation used in the evaluation was manually conducted by an expert team. The usual metrics of average mean precision, recal12 and F-measure 11 TREC Clinical Decision Support 2016 (on-line) 12 Relevant documents not included in the ranking ...
    ... 1.2 Classification introduction The problem of classifying documents in general occurs in two variants: clas- sification in a well-known, restricted domain of classes, and in an unknown one. For both, the problem is reduced to calculating the similarity of docu- ments, usually with use of the so-called ...

  • Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability

    Marija Živković, Dejan Ivezić (2021)
    Transformation of the heating sector is recognized as being essential for ensuring reliable and afordable energy services provided with reduced consumption of energy sources and diminished impact on the environment and less import dependency. The possibility of utilizing energy sources that otherwise would be wasted needs to be considered and treated as a big advantage of district heating systems. Despite many advantages, sewage wastewater heat is still a mostly unused resource at the global level and a totally unused ...
    рекуперација топлоте из отпадних вода, систем даљинског грејања, топлотне пумпе, енергетске уштеде, емисија угљендиоксида, енергетска безбедност, Србија
    ... DH systems. Data on heat pump performance in an Olympic village in Vancouver are given in Fiore and Genon (2014). Technical data and analyses of effectiveness of a heat pump installa- tion in Vladivostok are discussed in Alekseiko et al. (2014). Spatial and temporal considerations of the performance ...
    ... expected in the near future (Ministry of environmental protection 2019). One of the newest and most contemporary wastewater plant (in the city of Šabac) was selected in this paper, for the evaluation of sewage Fig. 4 Structure of fuel consumption in district heating systems in Serbia in 2017 Table ...
    ... inhabitant. In order to make results of the key performance indicators comparable, it was assumed that the heating area, the efficiency of buildings, and DH networks would be the same as in the base year. The obtained structure of energy sources in Serbian DH systems, in that case, is presented in Fig. 6 ...

  • Cytotoxic activity of tetradentate Schiff Base Copper(II) complexes

    Nevenka Gligorijević, Aleksandar Mijatović, Sandra Aranđelović, Rada Baošić (2021)
    Istraživanje kompleksa bakra kao potencijalnih antikancerogenih agenasa nudi ohrabrujuće perspektive u odnosu na komplekse platine (II) računajući na smanjenu toksičnost, novi mehanizam delovanja, različit spektar aktivnosti i perspektivu neunakrsne rezistencije. Kompleksi Šifovih baza bakra(II) koji sadrže tetradentatne ligande acac2en tipa (acac2en (1); tfacac2en (3), acactfacacen (4), acacphacacen (6)) pokazali su važnu antioksidativnu aktivnost, visok potencijal za interakciju sa HSA i DNK, u prethodnim studijama. Zbog toga je bilo interesantno ispitati i uporediti potencijal antikancerogene aktivnosti in vitro, u odnosu ...
    Bakar(II) kompleksi, citotoksičnost, ćelijski ciklus

  • Coupling of artificial intelligence methods in the development of hybrid intelligent systems

    Ranka Stanković, Ivan Obradović, Nikola Lilić (2001)
    In this paper we present an approach which couples various artificial intelligence (AI) methods in the solution of complex problems that cannot adequately be solved by a single AI method. We argue that the resulting, hybrid intelligent systems (HIS) can be successfully implemented with the use of available AI software libraries. Different coupling methods are analyzed and a classification of hybrid systems based on the chosen method is given. Two case studies of hybrid systems used in mining engineering ...
    hibridni inteligentni sistemi, spregnuti sistemi, metode veštačke inteligencije, rudarske primene veštačke inteligencije
    ... methods and conventional computer systems, such as database or spreadsheet applications. In this paper we present two hybrid intelligent systems which couple expert systems, neural networks and genetic algorithms in order to solve some complex problems in the area of mining engineering. In the realization ...
    ... software: the Kappa-PC expert system shell, and the dynamic libraries for neural networks (NeuroWindows) and genetic algorithms (Gene Hunter). In Section 2 we give a brief overview of the approaches to the coupling of AI methods in hybrid systems and their classification based on the coupling ...
    ... planing and analysis Ventilation planing and analysis is one of the most complex problems in mining engineering. We approached it by decomposing the global problem into several tasks, each of them solvable by a different method. These methods were then coupled in various ways which resulted in a hybrid ...

  • Analysis and Calculation of MMRS and Primary Gas Distribution Network in Urban Environment – Case Study Kučevo

    Aleksandar Madžarević, Pavle Janković (2022)
    Oblast primene prirodnog gasa je veoma široka. Kao energent može se koristiti za proizvodnju energije u elektranama, toplanama i postrojenjima za kombinovanu proizvodnju energije ili za zadovoljavanje različitih toplotnih potreba u industriji i širokoj potrošnji. Gas se može upotrebiti i kao sirovina u hemijskoj i petrohemijskoj industriji, a tokom poslednjih decenija nalazi primenu i u saobraćaju kao pogonsko gorivo u SUS motorima. Sa ekološkog stanovišta, prirodni gas predstavlja najprihvatljiviji izvor energije u poređenju sa drugim fosilnim gorivima. Pri sagorevanju ...
    distribucija gasa, projektovanje gasovoda, analiza potrošnje